| # Copyright 2000 Free Software Foundation, Inc. |
| # |
| # This program is free software; you can redistribute it and/or modify |
| # it under the terms of the GNU General Public License as published by |
| # the Free Software Foundation; either version 2, or (at your option) |
| # any later version. |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program; if not, write to the Free Software |
| # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| # 02110-1301, USA. |
| |
| # BISON_PROG_GNU_M4 |
| # ----------------- |
| # Check for GNU m4, at least 1.3 (supports frozen files). |
| AC_DEFUN([BISON_PROG_GNU_M4], |
| [AC_PATH_PROGS(M4, gm4 gnum4 m4, m4) |
| AC_CACHE_CHECK(whether m4 supports frozen files, ac_cv_prog_gnu_m4, |
| [ac_cv_prog_gnu_m4=no |
| if test x"$M4" != x; then |
| case `$M4 --help < /dev/null 2>&1` in |
| *reload-state*) ac_cv_prog_gnu_m4=yes ;; |
| esac |
| fi])]) |
